public Viewport() {
mPos.scale = mMinScale;
mPos.x = 0.5;
mPos.y = 0.5;
mPos.bearing = 0;
mPos.tilt = 0;
}
public boolean limitPosition(MapPosition pos) {
boolean changed = false;
if (pos.scale > mMaxScale) {
pos.scale = mMaxScale;
changed = true;
} else if (pos.scale < mMinScale) {
pos.scale = mMinScale;
changed = true;
}
if (pos.tilt > mMaxTilt) {
pos.tilt = mMaxTilt;
changed = true;
} else if (pos.tilt < mMinTilt) {
pos.tilt = mMinTilt;
changed = true;
}
if (pos.bearing > mMaxBearing) {
pos.bearing = mMaxBearing;
changed = true;
} else if (pos.bearing < mMinBearing) {
pos.bearing = mMinBearing;
changed = true;
}
if (pos.x > mMaxX) {
pos.x = mMaxX;
changed = true;
} else if (pos.x < mMinX) {
pos.x = mMinX;
changed = true;
}
if (pos.y > mMaxY) {
pos.y = mMaxY;
changed = true;
} else if (pos.y < mMinY) {
pos.y = mMinY;
changed = true;
}
return changed;
}
/**
* Get the current MapPosition.
*
* @param pos MapPosition to be updated.
* @return true iff current position is different from passed position.
*/
public boolean getMapPosition(MapPosition pos) {
boolean changed =
(pos.scale != mPos.scale
|| pos.x != mPos.x
|| pos.y != mPos.y
|| pos.bearing != mPos.bearing
|| pos.tilt != mPos.tilt);
pos.bearing = mPos.bearing;
pos.tilt = mPos.tilt;
pos.x = mPos.x;
pos.y = mPos.y;
pos.scale = mPos.scale;
pos.zoomLevel = FastMath.log2((int) mPos.scale);
return changed;
}